Eddie Flores had been working as an operative for his uncle Tito's drug cartel, in a division in Texas. Apparently, he and Riggs knew each other from there, but never really had that much close contact with each other.
Riggs and Murtaugh were working on a homicide case in connection with a narcotics trafficking case involving the Flores cartel, in which Eddie was in connection with. The homicide case involved a woman who appeared to have jumped off a building and onto a car, but along the way, it was narrowed down to that Eddie killed the woman. While investing the case further, Riggs believes that the cartel he is investigating is also in connection to Miranda's death, and that Eddie may very well have some part in her death, too. They go to find Eddie.
Eddie meets up with Riggs and Murtaugh. There, Riggs interrogates Eddie and tortures him to confessing to it. Just when Eddie was about to confess in his part of it and where Tito might be, he is shot and killed by his uncle Tito before anything else could be said.